SFI SYSTEM (w/ EGR System) MIL Circuit

DESCRIPTION

The MIL (Malfunction Indicator Lamp) is used to indicate vehicle malfunction detected by the ECM. When the power switch is turned on (IG), power is supplied to the MIL circuit, and the ECM provides the circuit ground which illuminates the MIL.

The MIL operation can be checked visually: When the power switch is first turned on (IG), the MIL should illuminate and should then turn off. If the MIL remains illuminated or is not illuminated, conduct the following troubleshooting procedure using the intelligent tester.

WIRING DIAGRAM

INSPECTION PROCEDURE

PROCEDURE

1. CHECK THAT MIL IS ILLUMINATED

   
   

   1. Turn the power switch on (IG).

   2. Check the illumination of the MIL.

      Result

      Condition	Proceed to
      MIL remains illuminated (Even after power switch is turned on (IG) and several seconds have passed, MIL still remains illuminated)	A
      MIL remains off (Does not illuminate at all)	B
      MIL illuminates for several seconds, but turns off after engine is started	C

   
   

   B

   CHECK THAT ENGINE STARTS Click here

   C

   SYSTEM OK

   A

2. CHECK WHETHER MIL TURNS OFF

   
   

   1. Connect the intelligent tester to the DLC3.

   2. Turn the power switch on (IG).

   3. Turn the tester on.

   4. Enter the following menus: Powertrain / Engine and ECT / DTC.

   5. Check if any DTCs have been stored. Note down the DTCs.

   6. Clear the DTCs Click here.

   7. Check if the MIL goes off.

      OK
      MIL goes off.

   
   

   NG

   CHECK HARNESS AND CONNECTOR (CHECK FOR SHORT IN WIRE HARNESS) Click here

   OK

   REPAIR CIRCUITS INDICATED BY OUTPUT DTCS Click here

3. CHECK HARNESS AND CONNECTOR (CHECK FOR SHORT IN WIRE HARNESS)

   
   

   1. Disconnect the A60 ECM connector.

   2. Turn the power switch on (IG).

   3. Check that the MIL is not illuminated.

      OK
      MIL is not illuminated.

   
   

   NG

   CHECK HARNESS AND CONNECTOR (COMBINATION METER ASSEMBLY - ECM) Click here

   OK

   REPLACE ECM Click here

4. CHECK HARNESS AND CONNECTOR (COMBINATION METER ASSEMBLY - ECM)

   
   

   1. Disconnect the combination meter assembly connector.

   2. Disconnect the ECM connector.

   3. Measure the resistance according to the value(s) in the table below.

      Standard Resistance
      Tester Connection Condition Specified Condition H19-28 (EFI) or A60-36 (W) - Body ground Always 10 kΩ or higher

   
   

   NG

   REPAIR OR REPLACE HARNESS OR CONNECTOR

   OK

   REPLACE COMBINATION METER ASSEMBLY Click here

5. CHECK THAT ENGINE STARTS

   
   

   1. Turn the power switch on (IG).

   2. Put the engine in inspection mode (maintenance mode) Click here.

   3. Start the engine.

      Result

      Result	Proceed to
      Engine starts	A
      Engine cannot be put in inspection mode* (Engine cannot start)	B

      Tech Tips

      *: The intelligent tester cannot communicate with the ECM.

   
   

   B

   GO TO VC OUTPUT CIRCUIT Click here

   A

6. CHECK HARNESS AND CONNECTOR (ECM TERMINAL VOLTAGE)

   
   

   1. Disconnect the ECM connector.

   2. Turn the power switch on (IG).

   3. Measure the voltage according to the value(s) in the table below.

      Standard Voltage
      Tester Connection Switch Condition Specified Condition A60-36 (W) - Body ground Power switch on (IG) 11 to 14 V

   
   

   NG

   CHECK HARNESS AND CONNECTOR (COMBINATION METER ASSEMBLY - ECM) Click here

   OK

   REPLACE ECM Click here

7. CHECK HARNESS AND CONNECTOR (COMBINATION METER ASSEMBLY - ECM)

   
   

   1. Disconnect the combination meter assembly connector.

   2. Disconnect the ECM connector.

   3. Measure the resistance according to the value(s) in the table below.

      Standard Resistance
      Tester Connection Condition Specified Condition H19-28 (EFI) - A60-36 (W) Always Below 1 Ω

   
   

   NG

   REPAIR OR REPLACE HARNESS OR CONNECTOR

   OK

   REPLACE COMBINATION METER ASSEMBLY Click here